Improved chair-seat



MWeme-mffice.

HENRY C. KNOWLTON, OF GARDNER, MASSACHUSETTS.

Letters .Patent No. 83,713,'dated November 3, 1868.

MPROVED GRAZIE-SEAT.'

The Schedule referred to in these Let-ters Patent and making pan of the lume.

To all persons to whom/these 'presents may come:

Be it known that I, Hanny C. KNoWL'roN, of Gardner, of the county of Worcester, and State of Massachusetts, have invented a new and useful Improvement in Chair-Seats; and do hereby declare the same to be fully described in the following specification, and represented in the accompanying drawing, which denotes a transverse section of a chair-seat provided with my improvement.

The seats,-on Whioh my invention is based, are such as are usuallyvcomposed oi 'a wooden frame, and a bottoming of interlined rattan strips.

In the drawings, the said frame is shown at A, and

the bottoniing at B. This latter may be of the char-l acter as mentioned, or it may be of olothLleather7 or other suitable material.'

The object of my improvement is to confine the bottoming to the frame, and at the same time, or afterl Wards, to effect the straining of the said bottoming. To this end form the frame with its inner face or side arranged rat an acute angle with the piane of the upper surface of the frame, such being as represented at ain the igure. l) he coniningebar C, by the aid of which the bottoming, near its edges, is to be clamped to the seat-frame, has eaoh of its screw-holes bformed through it at an obtuse angle with that face of vthe bar which is to go next to the frame. K Each of such holes should have a diameter somewhat greaterA than that ofthe shank ofthe screw D to go through, such hole and screw, when the iatteris screwed into the frame, being arranged in manner as represented, so that when the screw is in the aet of -fore-ing the bar up to the frame,

it shall cause the bar at the same time to have an upward or sliding movement, such as will strain the bottoming, such, near its edge, being introduced between the bar and the frame.

Were the screw D arranged at right angles to the bearing-faces of the bar andframe, it would, AWhile being set up, produce no upward movement of the bar. Therefore, it is the arrangement of the inner face of the frame at an acute angie with its upper face, in combination with the arrangement of each of the screws or its hole or holes at an obtuse angle with the bearing-faces of the bar and frame, that constitutes my improvement.

What, therefore, I claim as my invention in a chairseat of the kind described, is

The arrangement of the bearing-taces of the seatframe and each .of the confining-bars at an aeute angle with the upper surface4 of the seat-frame, in combina.- tion with the arrangement of each of the clampingscrews, so as to incline upward at an obtuse angle with the said bearing-faces, the screw-hole in theoonfiningbar being made so as to admit ofthe upward movement of the bar while it may be in the act of being forced against the bottoming to oonne it to the frame, the same serving to eiect not only the fixation of the bot torning to the frame, but the straining or tightening of the said bottoming, andthe setting of it up so as to be ush or even with or in its proper position with respect to the upper surface of the seat-frame.

HENRY C. KNOWLTON. .Witnessesz R. H. EDDY, F. P.- HALE, Jr. 

